User-agent sniffing advice for an AP/ASP environment

Hi

I know this is somewhat of a fringe question. However, I'd appreciate some guidance here from anyone knowing Articulate and ASPX files.

I have a client who has traditionally replayed their presentations from a PHP server.  I use a PHP snippet in the player.html file (renamed using .php) which sniffs an end-user's browser user-agent and delivers either the usual AP package (desktop) or a device-specific MP4 file (iPhone and iPad). The PHP script is a simple IF, THEN, ELSE scenario. It works well for my needs.

Anyway, my problem is that this client has just moved their archive to an ASP server (no PHP). Their server admin is having trouble implementing a similar user-agent sniffing fix, because of something related to aspx and how the AP javascript needs to be handled.

This is beyond my ability to fix myself. So, I'm about to go to oDesk or sim to find a fix. But, I wanted to check here first, to see if anyone has employed something similar or knows about the javascript issue mentioned and may be able to help.

Thanks in advance for your help..!!